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26. Which of the following serves as a reactant in photosynthesis and a product in cellular respiration?

A. O₂
B. CO₂
C. Sunlight
D. ATP

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27. Hydrogen (electron) acceptor in the light reactions is

A. ADP
B. NADP⁺
C. NAD⁺
D. FADH

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28. The cytochrome c oxidase complex

A. accepts electrons from cyt c
B. donates four electrons to O₂
C. pumps protons out of the matrix space
D. all of these

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29. In the Calvin cycle, carbon dioxide is fixed in a reaction with the

A. ribulose diphosphate
B. ribulose phosphate
C. ribose triphosphate
D. 3-phosphoglyceric acid

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30. What do NAD⁺, NADP⁺, and FAD⁺ all have in common?

A. They are reduced
B. They have a full complement of electrons
C. They are oxidized
D. They are what is used during carbon fixation in photosynthesis

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